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Abstract:- Thermodynamic analysis of the triple pressure reheat combined cycle gas turbine with duct burner are presented  and  discussed  in this  paper .The overall performance of a combined cycle Gas turbine power plant is influenced by the ambient temperature and turbine inlet temperature. These parameters affect the overall thermal efficiency, power output .The ambient temperature increases the gas temperature and also the individual steam   production rate also increased at each stage of the turbine. The exergy   is used to evaluate maximum irreversibility of the process present in the cycle.

Keywords: exergy, energy, HRSG

I.       Introduction

Heat Recovery Steam Generator (HRSG) is an interface between the gas cycle and the steam cycle in combined cycles. The classical approach to HRSG optimization is the “pinch-point” method, i.e. imposing the minimum temperature difference between the two agents.

The worldwide demand for combined cycle power plants is growing dramatically, with some experts forecasting explosive growth over the next decade. In its basic form, a gas turbine exhausting into a heat recovery steam generator (HRSG) that supplies steam to a steam turbine cycle is the most efficient system of generating electric electricity today. The last two decades with unit plant efficiencies of 30% to 35%, comparable to the state-of-the-art fossil-fired power stations. The below calculations give the information about the performance increased by installing the HRSG in combined cycle power plant.

A.      Steam Power Plant

Power plants generate electrical power by using fuels like coal, oil or natural gas. A simple power plant consists of a boiler, turbine, condenser and a pump. Fuel, burned in the boiler and super heater, heats the water to generate steam. The steam is then heated to a superheated state in the super heater. This steam is used to rotate the turbine which powers the generator.


Fig. 1: Layout of Steam power plant



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